Cable-type secondary battery

ABSTRACT

The present invention relates to a cable-type secondary battery having a horizontal cross section of a predetermined shape and extending longitudinally, comprising: a core for supplying lithium ions, which comprises an electrolyte; an inner electrode, comprising an open-structured inner current collector surrounding the outer surface of the core, and an inner electrode active material layer formed on the surface of the inner current collector; a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and an outer electrode surrounding the outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector. 
     The core disposed in the inner electrode having an open structure, from which the electrolyte of the core for supplying lithium ions can be easily penetrated into an electrode active material, thereby facilitating the supply and exchange of lithium ions.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 14/199,228, filed on Mar. 6, 2014, which is a continuation of International Application No. PCT/KR2012/008403 filed on Oct. 15, 2012, which claims priority under 35 USC 119(a) to Korean Patent Application No. 10-2011-0104872 filed in the Republic of Korea on Oct. 13, 2011 and Korean Patent Application No. 10-2012-0114446 filed in the Republic of Korea on Oct. 15, 2012, the disclosures of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a cable-type secondary battery, which can freely change in shape, and more particularly to a cable-type secondary battery having a core for supplying lithium ions.

BACKGROUND ART

Secondary batteries are devices capable of storing energy in chemical form and of converting into electrical energy to generate electricity when needed. The secondary batteries are also referred to as rechargeable batteries because they can be recharged repeatedly. Common secondary batteries include lead accumulators, NiCd batteries, NiMH accumulators, Li-ion batteries, Li-ion polymer batteries, and the like. When compared with disposable primary batteries, not only are the secondary batteries more economically efficient, they are also more environmentally friendly.

Secondary batteries are currently used in applications requiring low electric power, for example, equipment to start vehicles, mobile devices, tools, uninterruptible power supplies, and the like. Recently, as the development of wireless communication technologies has been leading to the popularization of mobile devices and even to the mobilization of many kinds of conventional devices, the demand for secondary batteries has been dramatically increasing. Secondary batteries are also used in environmentally friendly next-generation vehicles such as hybrid vehicles and electric vehicles to reduce the costs and weight and to increase the service life of the vehicles.

Generally, secondary batteries have a cylindrical, prismatic, or pouch shape. This is associated with a fabrication process of the secondary batteries in which an electrode assembly composed of an anode, a cathode, and a separator is mounted in a cylindrical or prismatic metal casing or a pouch-shaped casing of an aluminum laminate sheet, and in which the casing is filled with electrolyte. Because a predetermined mounting space for the electrode assembly is necessary in this process, the cylindrical, prismatic or pouch shape of the secondary batteries is a limitation in developing various shapes of mobile devices. Accordingly, there is a need for secondary batteries of a new structure that are easily adaptable in shape.

To fulfill this need, suggestions have been made to develop linear batteries having a very high ratio of length to cross-sectional diameter. Korean Patent Application publication No. 2005-99903 discloses a flexible battery consisting of an inner electrode, an outer electrode and an electrolyte layer interposed therebetween. However, such battery has poor flexibility. The linear batteries use a polymer electrolyte to form an electrolyte layer, but this causes difficulties in the inflow of the electrolyte into an electrode active material, thereby increasing the resistance of the batteries and deteriorating the capacity and cycle characteristics thereof.

DISCLOSURE Technical Problem

The present invention is designed to solve the problems of the prior art, and therefore it is an object of the present invention to provide a secondary battery having a new linear structure, which can easily change in shape, maintain excellent stability and performances as a secondary battery, and facilitate the inflow of an electrolyte into an electrode active material.

Technical Solution

In order to achieve the objects, the present invention provides a cable-type secondary battery having a horizontal cross section of a predetermined shape and extending longitudinally, comprising: a core for supplying lithium ions, which comprises an electrolyte; an inner electrode, comprising an open-structured inner current collector surrounding the outer surface of the core for supplying lithium ions, and an inner electrode active material layer formed on the surface of the inner current collector; a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and an outer electrode surrounding the outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector.

The open-structured inner current collector is preferably in the form of a wound wire or a mesh, but is not particularly limited thereto.

In the outer electrode, the outer electrode active material layer may be formed to surround the outer surface of the separation layer, and the outer current collector may be formed to surround the outer surface of the outer electrode active material layer; the outer current collector may be formed to surround the outer surface of the separation layer, and the outer electrode active material layer may be formed to surround the outer surface of the outer current collector; the outer current collector may be formed to surround the outer surface of the separation layer, and the outer electrode active material layer may be formed to surround the outer surface of the outer current collector and come into contact with the separation layer; or the outer electrode active material layer may be formed to surround the outer surface of the separation layer, and the outer current collector may be formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom.

In the present invention, the outer current collector is not particularly limited to its forms, but is preferably in the form of a pipe, a wound wire, a wound sheet or a mesh.

The inner current collector is not particularly limited to its kinds, but is made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on the surface thereof; or a conductive polymer.

Examples of the conductive material which may be used in the present invention include polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, indium tin oxide (ITO), silver, palladium, nickel, and mixtures thereof.

The outer current collector may be made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on the surface thereof; a conductive polymer; a metal paste comprising metal powders of Ni, Al, Au, Ag, Al, Pd/Ag, Cr, Ta, Cu, Ba or ITO; or a carbon paste comprising carbon powders of graphite, carbon black or carbon nanotube.

In the present invention, the core for supplying lithium ions comprises an electrolyte, and examples of the electrolyte may include, but are not particularly limited to, a non-aqueous electrolyte solution using ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl formate (MF), γ-butyrolactone (γ-BL), sulfolane, methyl acetate (MA) or methyl propionate (MP); a gel polymer electrolyte using PEO, PVdF, PVdF-HEP, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc). The electrolyte further comprises a lithium salt, and the preferred examples of the lithium salt include LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and mixtures thereof.

In the present invention, the inner electrode may be an anode and the outer electrode may be a cathode, or the inner electrode may be a cathode and the outer electrode may be an anode.

When the inner electrode of the present invention is an anode and the outer electrode is a cathode, the inner electrode active material layer may comprise an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof, and the outer electrode active material layer may comprise an active material selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, LiNiMnCoO2, LiNi1-x-y-zCoxM1yM2zO02 (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are each independently an atomic fraction of oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof.

Alternatively, when the inner electrode is a cathode and the outer electrode is an anode, the inner electrode active material layer may comprise an active material selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, LiNiMnCoO2, LiNi1-x-y-zCoxM1yM2zO2 (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are each independently an atomic fraction of oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof, and the outer electrode active material layer may comprise an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof, but the present invention is not particularly limited thereto.

In the present invention, the separation layer may be an electrolyte layer or a separator.

The electrolyte layer is not particularly limited to its kinds, but preferably is made of an electrolyte selected from a gel polymer electrolyte using PEO, PVdF, PMMA, PAN, or PVAc; and a solid electrolyte of PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc). Also, the electrolyte layer may further comprise a lithium salt, and non-limiting examples of the lithium salt include LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and mixtures thereof.

When the separation layer is a separator, the cable-type secondary battery of the present invention needs an electrolyte solution, and examples of the separator may include, but is not limited to, a porous substrate made of a polyolefin-based polymer selected from the group consisting of ethylene homopolymers, propylene homopolymers, ethylene-butene copolymers, ethylene-hexene copolymers, and ethylene-methacrylate copolymers; a porous substrate made of a polymer selected from the group consisting of polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyether ether ketones, polyether sulfones, polyphenylene oxides, polyphenylene sulfides and polyethylene naphthalenes; or a porous substrate made of a mixture of inorganic particles and a binder polymer.

Further, the present invention provides a cable-type secondary battery having multiple inner electrodes, and also a cable-type secondary battery having multiple inner electrodes with a separation layer.

Advantageous Effects

In accordance with the present invention, a core for supplying lithium ions, which comprises an electrolyte, is disposed in the inner electrode having an open structure, from which the electrolyte of the core for supplying lithium ions can be easily penetrated into an electrode active material, thereby facilitating the supply and exchange of lithium ions. Accordingly, the cable-type secondary battery of the present invention has such a core for supplying lithium ions to exhibit superior capacity and cycle characteristics. Also, the cable-type secondary battery of the present invention has an inner electrode having an open structure to exhibit good flexibility.

DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate preferred embodiments of the present invention and, together with the foregoing disclosure, serve to provide further understanding of the technical spirit of the present invention. However, the present invention is not to be construed as being limited to the drawings.

FIG. 1 shows a cable-type secondary battery having one inner electrode in the form of a mesh in accordance with one embodiment of the present invention.

FIG. 2 shows a cable-type secondary battery having one inner electrode in the form of a wound wire in accordance with one embodiment of the present invention.

FIG. 3 is a cross-sectional view of a cable-type secondary battery having multiple inner electrodes in accordance with one embodiment of the present invention.

FIG. 4 is a cross-sectional view of a cable-type secondary battery having multiple inner electrodes provided with each separation layer in accordance with one embodiment of the present invention.

FIG. 5 is a graph showing first charging/discharging profiles for cable-type secondary batteries of the Example and Comparative Example.

FIG. 6 shows discharging life characteristics for cable-type secondary batteries of the Example and Comparative Example.

FIG. 7 shows the results of AC impedence measurements for cable-type secondary batteries obtained in the Example and Comparative Example.

FIG. 8 is photographs showing the grip part of a tensile tester for evaluating the flexibility of the cable-type secondary battery obtained in the Example.

FIG. 9 is a graph showing the flexibility evaluation result for the cable-type secondary battery obtained in the Example.

BEST MODE

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to the description, it should be understood that the terms used in the specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation.

FIG. 1 schematically shows a cable-type secondary battery according to one embodiment of the present invention. However, the configurations illustrated in the drawings and the embodiments are just preferable examples for the purpose of illustrations only, not intended to limit the scope of the disclosure, so it should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the disclosure.

In accordance with the present invention, a cable-type secondary battery 100 having a horizontal cross section of a predetermined shape and extending longitudinally comprises a core 110 for supplying lithium ions, which comprises an electrolyte; an inner electrode comprising an open-structured inner current collector 120 surrounding the outer surface of the core for supplying lithium ions, and an inner electrode active material layer 130 formed on the surface of the inner current collector 120; a separation layer 140 surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and an outer electrode surrounding the outer surface of the separation layer 140 and comprising an outer electrode active material layer and an outer current collector.

In the present invention, the outer electrode may be formed in various embodiments depending on the disposition of the outer electrode active material layer and the outer current collector, which come into contact with the separation layer.

In FIG. 1, the outer electrode comprises an outer electrode active material layer 150 surrounding the outer surface of the separation layer 140 and an outer current collector 160 surrounding the outer surface of the outer electrode active material layer 150.

Also, the outer electrode of the cable-type secondary battery according to one embodiment of the present invention may be formed in a structure having the outer current collector formed to surround the outer surface of the separation layer, and the outer electrode active material layer formed to surround the outer surface of the outer current collector; a structure having the outer current collector formed to surround the outer surface of the separation layer, and the outer electrode active material layer formed to surround the outer surface of the outer current collector and to come into contact with the separation layer; or a structure having the outer electrode active material layer formed to surround the outer surface of the separation layer, and the outer current collector formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom.

The term ‘a predetermined shape’ used herein refers to not being limited to any particular shape, and means that any shape that does not damage the nature of the present invention is possible. The cable-type secondary battery of the present invention has a horizontal cross section of a predetermined shape, a linear structure, which extends in the longitudinal direction, and flexibility, so it can freely change in shape. Also, the term ‘open-structured’ used herein means that a structure has an open boundary surface through which a substance may be transferred freely from the inside of the structure to the outside thereof.

The conventional cable-type secondary batteries have an electrolyte layer which is interposed between an inner electrode and an outer electrode. In order for the electrolyte layer to isolate the inner electrode from the outer electrode and prevent a short circuit, it is required that the electrolyte layer be made of gel-type polymer electrolytes or solid polymer electrolytes having a certain degree of mechanical properties. However, such gel-type polymer electrolytes or solid polymer electrolytes fail to provide superior performances as a source for lithium ions, so an electrolyte layer made of such should have an increased thickness so as to sufficiently provide lithium ions. Such a thickness increase in the electrolyte layer widens an interval between the electrodes to cause resistance increase, thereby deteriorating battery performances. In contrast, since the cable-type secondary battery 100 of the present invention has the core 110 for supplying lithium ions, which comprises an electrolyte, and the inner current collector 120 of the present invention has an open structure, the electrolyte of the core 110 for supplying lithium ions can pass through the inner current collector 120 to reach the inner electrode active material layer 130 and the outer electrode active material layer 150. Accordingly, it is not necessary to excessively increase the thickness of an electrolyte layer. Also, an electrolyte layer may not be adopted as an essential component, and therefore, only a separator may be optionally used. Thus, the cable-type secondary battery of the present invention has the core 110 for supplying lithium ions, which comprises an electrolyte, to facilitate the penetration of an electrolyte into an electrode active material, and eventually facilitate the supply and exchange of lithium ions in electrodes, thereby exhibiting superior capacity and cycle characteristics.

The core 110 for supplying lithium ions comprises an electrolyte, and examples of the electrolyte may include, but are not particularly limited to, a non-aqueous electrolyte solution using ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl formate (MF), γ-butyrolactone (γ-BL), sulfolane, methyl acetate (MA) or methyl propionate (MP); a gel polymer electrolyte using PEO, PVdF, PVdF-HEP, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc). The electrolyte further comprises a lithium salt, and the preferred examples of the lithium salt include LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and the like. Also, the core 110 for supplying lithium ions may consist of only an electrolyte, and in the case of a liquid electrolyte, a porous carrier may be used together.

The inner current collector 120 of the present invention has an open structure, which allows the penetration of the electrolyte comprised in the core 110 for supplying lithium ions, and such an open structure may be any form if it facilitates the penetration of the electrolyte. Referring to FIGS. 1 and 2, as a non-limiting example of the open-structured inner current collector, a wound wire-type inner current collector 220 and a mesh-form inner current collector 120 are illustrated.

The inner current collector 120, 220 is preferably made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on the surface thereof; or a conductive polymer.

The current collector serves to collect electrons generated by electrochemical reaction of the active material or to supply electrons required for the electrochemical reaction. In general, the current collector is made of a metal such as copper or aluminum. Especially, when the current collector is made of a non-conductive polymer treated with a conductive material on the surface thereof or a conductive polymer, the current collector has a relatively higher flexibility than the current collector made of a metal such as copper or aluminum. Also, a polymer current collector may be used instead of the metal current collector to reduce the weight of the battery.

The conductive material may include polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, indium tin oxide (ITO), copper, silver, palladium, nickel, etc. The conductive polymer may include polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, etc. However, the non-conductive polymer used for the current collector is not particularly limited to its kinds.

In the present invention, the inner electrode active material layer 130 is formed on the surface of the inner current collector 120 to surround the outside of the inner current collector 120. This configuration may comprise a case in which the open structure of the inner current collector 120 is not exposed to the outer surface of the inner electrode active material layer 130, as well as a case in which the inner electrode active material layer 130 is formed on the surface of the open structure of the inner current collector 120 so that the open structure of the inner current collector 120 is exposed to the outer surface of the inner electrode active material layer 130. For example, an electrode active material layer may be formed on the surface of a wound wire-form current collector, or a wire-form current collector having an electrode active material formed thereon may be wound.

In the present invention, the outer current collector is not particularly limited to its forms, but is preferably in the form of a pipe, a wound wire, a wound sheet or a mesh. The outer current collector may be made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on the surface thereof; a conductive polymer; a metal paste comprising metal powders of Ni, Al, Au, Ag, Al, Pd/Ag, Cr, Ta, Cu, Ba or ITO; or a carbon paste comprising carbon powders of graphite, carbon black or carbon nanotube.

The inner electrode may be an anode and the outer electrode may be a cathode. Alternatively, the inner electrode may be a cathode and the outer electrode may be an anode.

In the present invention, the electrode active material layer allows ions to move through the current collector, and the movement of ions is caused by the interaction of ions such as intercalation/deintercalation of ions into and from the electrolyte layer.

Such an electrode active material layer may be divided into an anode active material layer and a cathode active material layer.

Specifically, when the inner electrode is an anode and the outer electrode is a cathode, the inner electrode active material layer becomes an anode active material layer and may be made of an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof, and the outer electrode active material layer becomes a cathode active material layer and may be made of an active material selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, LiNiMnCoO2, LiNi1-x-y-zCoxM1yM2zO2 (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are each independently an atomic fraction of oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof.

Alternatively, when the inner electrode is a cathode and the outer electrode is an anode, the inner electrode active material layer becomes a cathode active material layer and the outer electrode active material layer becomes an anode active material layer.

As mentioned above, referring to FIG. 1, the outer electrode comprises an outer electrode active material layer 150 surrounding the outer surface of the separation layer 140 and an outer current collector 160 surrounding the outer surface of the outer electrode active material layer 150.

Also, the outer electrode may have the outer current collector formed to surround the outer surface of the separation layer, and the outer electrode active material layer formed to surround the outer surface of the outer current collector; may have the outer current collector formed to surround the outer surface of the separation layer, and the outer electrode active material layer formed to surround the outer surface of the outer current collector and to come into contact with the separation layer; or may have the outer electrode active material layer formed to surround the outer surface of the separation layer, and the outer current collector formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom.

Specifically, if the outer current collector is wound on the outer surface of the separation layer, a contact area of the separation layer and the active material layer sufficiently increases to ensure a certain degree of battery performances. Particularly, since the outer electrode active material layer of the present invention is formed by coating an active material in the form of a slurry on the outer surface of the outer current collector, the outer electrode active material layer comes into contact with the separation layer. Also, the outer current collector is included inside the outer electrode active material layer by being covered therein, while surrounding the outer surface of the separation layer with spacing apart therefrom by the outer electrode active material layer. As a result, an electric contact between the outer current collector and the outer electrode active material layer is improved, thereby contributing to the enhancement of battery characteristics.

For example, when the outer current collector is in the form of a wound wire having flexibility, the wound wire-form outer current collector has elasticity due to its form to enhance the overall flexibility of the cable-type secondary battery. Also, when excessive external force is applied to the cable-type secondary battery of the present invention, the wire-form outer current collector of the present invention undergoes very little excessive deformation such as crumpling or bending, so a short circuit due to a contact with an inner current collector may be avoided.

The electrode active material layer comprises an electrode active material, a binder and a conductive material, and is combined with a current collector to configure an electrode. If the electrode is deformed by bending or severely folding due to external force, the electrode active material may be released. The release of the electrode active material deteriorates the performance and capacity of batteries. However, in accordance with the present invention, the wound wire-form outer current collector having elasticity functions to disperse the applied force when such a deformation occurs by the external force, from which the active material layer is less deformed, thereby preventing the release of the active material. The separation layer of the present invention may be an electrolyte layer or a separator.

The electrolyte layer serving as an ion channel may be made of a gel-type polymer electrolyte using PEO, PVdF, PVdF-HFP, PMMA, PAN or PVAC, or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulfide (PES) or polyvinyl acetate (PVAc). The matrix of the solid electrolyte is preferably formed using a polymer or a ceramic glass as the backbone. In the case of typical polymer electrolytes, the ions move very slowly in terms of reaction rate, even when the ionic conductivity is satisfied. Thus, the gel-type polymer electrolyte which facilitates the movement of ions is preferably used compared to the solid electrolyte. The gel-type polymer electrolyte has poor mechanical properties and thus may comprise a porous support or a cross-linked polymer to improve poor mechanical properties. The electrolyte layer of the present invention can serve as a separator, and thus an additional separator may be omitted.

The electrolyte layer of the present invention may further comprise a lithium salt. The lithium salt can improve an ionic conductivity and response time. Non-limiting examples of the lithium salt may include LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, lithium chloroborate, lower aliphatic lithium carbonate, and lithium tetraphenylborate.

Examples of the separator may include, but is not limited to, a porous substrate made of a polyolefin-based polymer selected from the group consisting of ethylene homopolymers, propylene homopolymers, ethylene-butene copolymers, ethylene-hexene copolymers, and ethylene-methacrylate copolymers; a porous substrate made of a polymer selected from the group consisting of polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyether ether ketones, polyether sulfones, polyphenylene oxides, polyphenylene sulfides and polyethylene naphthalenes; or a porous substrate made of a mixture of inorganic particles and a binder polymer. Among these, in order for the lithium ions of the core for supplying lithium ions to be transferred to the outer electrode, it is preferred to use a non-woven fabric separator corresponding to the porous substrate made of a polymer selected from the group consisting of polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyether ether ketones, polyether sulfones, polyphenylene oxides, polyphenylene sulfides and polyethylene naphthalenes.

Also, the cable-type secondary battery of the present invention has a protection coating. The protection coating is an insulator and is formed to surround the outer current collector, thereby protecting the electrodes against moisture in the air and external impacts. The protection coating may be made of conventional polymer resins, for example, PVC, HDPE or epoxy resins.

Hereinafter, a cable-type secondary battery according to one embodiment of the present invention and the manufacture thereof will be briefly explained with reference to FIG. 2.

A cable-type secondary battery 200 according to one embodiment of the present invention comprises a core 210 for supplying lithium ions, which comprises an electrolyte; an inner electrode comprising an open-structured inner current collector 120 surrounding the outer surface of the core for supplying lithium ions and an inner electrode active material layer 230 formed on the surface of the inner current collector 220; a separation layer 240 surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and an outer electrode comprising an outer electrode active material layer 250 surrounding the outer surface of the separation layer 240 and an outer current collector 260 surrounding the outer surface of the outer electrode active material layer 250.

First, a polymer electrolyte is provided in the form of a wire using an extruder to prepare the core 210 for supplying lithium ions. Also, the core 210 for supplying lithium ions may be formed by providing a hollow inner electrode and introducing a non-aqueous electrolyte solution in the center of the inner electrode, or may be formed by providing a battery assembly comprising a protection coating as well as the others and introducing a non-aqueous electrolyte solution in the center of the inner electrode support comprised in the battery assembly. Alternatively, the core 210 for supplying lithium ions may be prepared by providing a wire-form carrier made of a sponge material and introducing a non-aqueous electrolyte solution thereto.

Then, a linear wire-form inner current collector 220 is provided and wound in the core 210 for supplying lithium ions. On the surface of the wound wire-form inner current collector 220, an inner electrode active material layer is formed by way of coating. The coating may be carried out by various conventional methods, for example, by an electroplating process or an anodic oxidation process. Also, in order to maintain constant intervals, an electrode slurry containing an active material may be discontinuously applied by way of an extrusion-coating using an extruder. In addition, the electrode slurry containing an active material may be applied by way of dip coating or extrusion-coating using an extruder.

Subsequently, the separation layer 240 consisting of a polymer electrolyte layer is formed to surround the inner electrode active material layer 240. The method for forming separation layer 240 as an electrolyte layer is not particularly limited, but an extrusion coating method is preferably used to facilitate the manufacturing process due to the nature of the linear cable-type secondary battery.

On the outer surface of the separation layer 240 formed by the coating of an electrolyte, the outer electrode active material layer 250 is formed by way of coating. The coating method of the inner electrode active material layer 250 may be identically applied to the outer electrode active material layer 230.

Then, an outer current collector in the form of a wire is provided and wound on the outer surface of the outer electrode active material layer 250 to form the wound wire-form outer current collector 260. In the present invention, as the outer current collector, a wound sheet-, pipe- or mesh-form current collector may be used. At this time, the outer electrode active material layer may be first formed on the outer current collector and then the separation layer is applied thereon, to form the outer electrode. For example, in the case of the wound sheet-form current collector, the outer electrode active material layer may be first formed on the wound sheet-form current collector, followed by cutting into a piece having a predetermined size, to prepare a sheet-form outer electrode. Then, the prepared sheet-form outer electrode may be wound on the outer surface of the separation layer so that the outer electrode active material layer comes into contact with the separation layer, to form the outer electrode on the separation layer.

As another method, in the formation of the outer electrode, the outer current collector may be first formed to surround the outer surface of the separation layer, followed by forming the outer electrode active material layer to surround the outer surface of the outer current collector.

Meanwhile, in the case of a structure having the outer current collector formed to surround the outer surface of the separation layer, and the outer electrode active material layer formed to surround the outer surface of the outer current collector and to come into contact with the separation layer, first, an outer current collector, for example, in the form of a wire or sheet, is wound on the outer surface of the separation layer. The winding method is not particularly limited. For example, in the case of the wire-form current collector, the winding may be carried out by using a winding machine on the outer surface of the separation layer. Then, the outer electrode active material layer is formed by way of coating on the outer surface of the wound wire- or sheet-form outer current collector so that the outer electrode active material layer surrounds the outer current collector and comes into contact with the separation layer.

Also, in the case of a structure having the outer electrode active material layer formed to surround the outer surface of the separation layer, and the outer current collector formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom, first, on the outer surface of the separation layer, a part of the outer electrode active material layer to be finally obtained is formed, on which the outer current collector is formed to surround the part of the outer electrode active material layer, and then the outer electrode active material layer is further formed on the outer current collector to completely cover the outer current collector. Thereby, the outer current collector is disposed inside the outer electrode active material layer to improve an electric contact between the current collector and the active material, thereby enhancing battery characteristics.

Finally, the protection coating 270 is formed to surround the outer surface of the electrode assembly. The protection coating 270 is an insulator and is formed on the outermost surface for the purpose of protecting the electrodes against moisture in the air and external impacts. As the protection coating 270, conventional polymer resins, for example, PVC, HDPE and epoxy resins may be used.

Hereinafter, another embodiment of the present invention will be briefly explained with reference to FIGS. 3 and 4.

Referring to FIG. 3, a cable-type secondary battery 300 according to one embodiment of the present invention comprises two or more cores 310 for supplying lithium ions, which comprise an electrolyte; two or more inner electrodes arranged parallel to each other, each inner electrode surrounding the outer surface of each core for supplying lithium ions, and comprising an open-structured inner current collector 320 to surround the outer surface of each core 310 for supplying lithium ions, and an inner electrode active material layer 330 formed on the surface of the inner current collector 320; a separation layer 340 surrounding the outer surface of the inner electrodes to prevent a short circuit between electrodes; and an outer electrode comprising an outer electrode active material layer 350 surrounding the outer surface of the separation layer 340 and an outer current collector 360 surrounding the outer surface of the outer electrode active material layer 350. Such a cable-type secondary battery 300 has the inner electrode consisting of multiple electrodes, thereby allowing controlling the balance between a cathode and anode and preventing a short circuit.

Referring to FIG. 4, a cable-type secondary battery 400 according to one embodiment of the present invention comprises two or more cores 410 for supplying lithium ions, which comprise an electrolyte; two or more inner electrodes arranged parallel to each other, each inner electrode surrounding the outer surface of each core for supplying lithium ions, and comprising an open-structured inner current collector 420 to surround the outer surface of each core 410 for supplying lithium ions, an inner electrode active material layer 430 formed on the surface of the inner current collector 420, and a separation layer 440 surrounding the outer surface of the inner electrode active material layer 430; and an outer electrode comprising an outer electrode active material layer 450 surrounding together the outer surfaces of the inner electrodes and an outer current collector 460 surrounding the outer surface of the outer electrode active material layer 450. Such a cable-type secondary battery 400 has the inner electrode consisting of multiple electrodes, thereby allowing controlling the balance between a cathode and anode and preventing a short circuit.

Also, in these cable-type secondary batteries having multiple inner electrodes, besides the structure of the outer electrode having the outer electrode active material layer formed to surround the outer surface of the separation layer, and the outer current collector formed to surround the outer surface of the outer electrode active material layer, as mentioned above, the outer electrode may be formed in a structure having the outer current collector formed to surround the outer surface of the separation layer, and the outer electrode active material layer formed to surround the outer surface of the outer current collector; a structure having the outer current collector formed to surround the outer surface of the separation layer, and the outer electrode active material layer formed to surround the outer surface of the outer current collector and to come into contact with the separation layer; or a structure having the outer electrode active material layer formed to surround the outer surface of the separation layer, and the outer current collector formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom.

Hereinafter, various preferred examples of the present invention will be described in detail for better understanding. However, the examples of the present invention may be modified in various ways, and they should not be interpreted as limiting the scope of the invention. The examples of the present invention are just for better understanding of the invention to persons having ordinary skill in the art.

EXAMPLE

On a Cu wire having a diameter of 125 m, Ni—Sn was coated by way of electroplating, to form a Ni—Sn-coated Cu wire electrode. Three Ni—Sn-coated Cu wire electrodes were spirally twisted so as to provide strength thereto, to prepare a twisted Ni—Sn-coated Cu wire bundle. Four bundles thus prepared were wound to form an open-structured hollow inner electrode in a spring form, in which a core for supplying lithium ions can be formed. A separator, and an Al wire as an outer current collector were wound in sequence to surround the inner electrode, and then LiCoO2/Denka black/PVdF (90/5/5 wt %) was coated on the outside thereof, to form an outer electrode. The outer electrode and the inner electrode were connected to an Al tab and a Ni tab, respectively, to form a terminal. The battery assembly thus formed was inserted in a heat shrinkable tube as a protection coating, the tube was shrunk by heat, and then a non-aqueous solution (1M LiPF6, EC/PC=1/1 (vol %) was introduced in the center of the open structured inner electrode current collector (twisted Ni—Sn-coated Cu wire bundles) using an injector, to form a core for supplying lithium ions. Then, a complete sealing was conducted to prepare a cable-type secondary battery.

COMPARATIVE EXAMPLE

Twelve Ni—Sn-coated Cu wire electrodes formed by the same procedure as the above Example were spirally twisted to form an inner electrode having no space therein. A separator, an Al wire as an outer current collector, an outer electrode active material layer, and Ni—Al tabs were formed by the same procedure as the above Example. In order to provide a lithium ion source in the resultant battery assembly, the battery assembly was immersed in a bath of a non-aqueous electrolyte solution for a day so that the components of the electrolyte solution were wetted into the battery assembly. The non-aqueous electrolyte solution was the same as the above Example. Then, the battery assembly was inserted in a heat shrinkable tube, followed by sealing, to prepare a cable-type secondary battery.

Test Example 1 Evaluation of Battery Characteristics

The cable-type batteries prepared in the Example and Comparative Example were subject to a charging/discharging test under the conditions of a current density of 1 C and a voltage ranging from 4.2V to 2.5V. From first charging/discharging profiles shown in FIG. 5 and discharging life characteristics shown in FIG. 6, it was confirmed that the battery of the Example exhibited the desired degree (1 mAh/cm) of battery capacity and stable cycle life characteristics, whereas the battery of the Comparative Example failed to obtain sufficient battery capacity and exhibited unstable cycle life characteristics. Thus, in the cable-type battery of the Example which comprises an open-structured inner electrode having a core for supplying lithium ions therein, the electrolyte of the core for supplying lithium ions can be easily penetrated into an electrode active material to facilitate the supply and exchange of lithium ions in the electrodes, thereby exhibiting superior battery capacity and cycle life characteristics.

Test Example 2 Measurement of Impedence

The batteries prepared in the Example and Comparative Example were charged and discharged once under the conditions of a current density of 1 C and a voltage ranging from 4.2V to 2.5V, and then measured for their impedence in the frequency range of 100 kHz to 1 Hz. As shown in FIG. 7, the battery of the Example has a substantially lower ohmic resistance (100 kHz) and interface resistance (the measured diameter of a hemisphere) than those of the battery of the Comparative Example. This means that the battery of the Example has a lower resistance as compared with the battery of the Comparative Example. That is, the battery of the Example can penetrate an electrolyte into an electrode active material through the open-structure of the inner electrode having a core for supplying lithium ions therein, and facilitate the supply and exchange of lithium ions in the electrodes, from which the resistance of the battery can decrease.

Test Example 3 Real-Time Bending Test for Flexibility Evaluation

In order to evaluate the flexibility of the battery prepared in the Example, the battery was immobilized in the grip of a tensile tester shown in FIG. 8, then repeatedly subject to bending/unbending at a speed of 500 mm/min in the range of 1 to 6 cm. At this time, in order to evaluate an actual flexibility of the battery of the Example, the battery was discharged at a current density of 0.1 C by connecting both terminals of the battery to the (+) and (−) terminals of a charging and discharging regulator. From the results shown in FIG. 9, the battery of the Example exhibited stable battery characteristics with no change in the discharging profile thereof under severe bending conditions. Thus, it was confirmed that the battery of the Example had good flexibility due to an open-structured inner electrode having a wound spring form and a wound Al wire.

EXPLANATION OF REFERENCE NUMERALS

-   -   100, 200, 300, 400: Cable-type Secondary Battery     -   110, 210, 310, 410: Core for Supplying Lithium Ions     -   120, 220, 320, 420: Inner Current Collector     -   130, 230, 330, 430: Inner Electrode Active Material Layer     -   140, 240, 340, 440: Separation Layer     -   150, 250, 350, 450: Outer Electrode Active Material Layer     -   160, 260, 360, 460: Outer Current Collector     -   170, 270, 370, 470: Protection Coating 

1. (canceled)
 2. A cable-type secondary battery comprising: a core including an electrolyte for supplying lithium ions; an inner electrode comprising an inner current collector surrounding the core for supplying lithium ions and an inner electrode active material layer formed on a surface of the inner current collector; a separation layer surrounding an outer surface of the inner electrode; and an outer electrode surrounding an outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector.
 3. The cable-type secondary battery according to claim 2, wherein the inner current collector is an open-structured inner current collector.
 4. The cable-type secondary battery according to claim 3, wherein the open-structured inner current collector is in the form of a wound wire or a mesh.
 5. The cable-type secondary battery according to claim 2, wherein in the outer electrode, the outer electrode active material layer is formed to surround the outer surface of the separation layer, and the outer current collector is formed to surround an outer surface of the outer electrode active material layer; the outer current collector is formed to surround the outer surface of the separation layer, and the outer electrode active material layer is formed to surround an outer surface of the outer current collector; the outer current collector is formed to surround an outer surface of the separation layer, and the outer electrode active material layer is formed to surround the outer surface of the outer current collector and come into contact with the separation layer; or the outer electrode active material layer is formed to surround an outer surface of the separation layer, and the outer current collector is formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom.
 6. The cable-type secondary battery according to claim 2, wherein the outer current collector is in the form of a pipe, a wound wire, a wound sheet or a mesh.
 7. The cable-type secondary battery according to claim 2, wherein the inner current collector is made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on a surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on a surface thereof; or a conductive polymer.
 8. The cable-type secondary battery according to claim 7, wherein the conductive material is selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, indium tin oxide (ITO), silver, palladium, nickel, and mixtures thereof.
 9. The cable-type secondary battery according to claim 7, wherein the conductive polymer is selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, and mixtures thereof.
 10. The cable-type secondary battery according to claim 2, wherein the outer current collector is made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on a surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on a surface thereof; a conductive polymer; a metal paste comprising metal powders of Ni, Al, Au, Ag, Pd/Ag, Cr, Ta, Cu, Ba or ITO; or a carbon paste comprising carbon powders of graphite, carbon black or carbon nanotube.
 11. The cable-type secondary battery according to claim 2, wherein the electrolyte comprises an electrolyte selected from a non-aqueous electrolyte solution using ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl formate (MF), γ-butyrolactone (γ-BL), sulfolane, methyl acetate (MA) or methyl propionate (MP); a gel polymer electrolyte using PEO, PVdF, PVdF-HEP, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).
 12. The cable-type secondary battery according to claim 2, wherein the electrolyte further comprises a lithium salt.
 13. The cable-type secondary battery according to claim 12, wherein the lithium salt is selected from the group consisting of LiCl, LiBr, LiI, LiClO₄, LiBF₄, LiB₁₀Cl₁₀, LiPF₆, LiCF₃SO₃, LiCF₃CO₂, LiAsF₆, LiSbF₆, LiAlCl₄, CH₃SO₃Li, CF₃SO₃Li, (CF₃SO₂)₂NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and mixtures thereof.
 14. The cable-type secondary battery according to claim 2, wherein the inner electrode is an anode and the outer electrode is a cathode, or the inner electrode is a cathode and the outer electrode is an anode.
 15. The cable-type secondary battery according to claim 2, wherein when the inner electrode is an anode and the outer electrode is a cathode, the inner electrode active material layer comprises an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof, and the outer electrode active material layer comprises an active material selected from the group consisting of LiCoO₂, LiNiO₂, LiMn₂O₄, LiCoPO₄, LiFePO₄, LiNiMnCoO₂, LiNi_(1-x-y-z)Co_(x)M1_(y)M2_(z)O₂ (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are each independently an atomic fraction of oxide-forming elements, in which 0≦x≦0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof.
 16. The cable-type secondary battery according to claim 2, wherein when the inner electrode is a cathode and the outer electrode is an anode, the inner electrode active material layer comprises an active material selected from the group consisting of LiCoO₂, LiNiO₂, LiMn₂O₄, LiCoPO₄, LiFePO₄, LiNiMnCoO₂, LiNi_(1-x-y-z)Co_(x)M1_(y)M2_(z)O₂ (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are each independently an atomic fraction of oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof, and the outer electrode active material layer comprises an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof.
 17. The cable-type secondary battery according to claim 2, wherein the separation layer is an electrolyte layer or a separator.
 18. The cable-type secondary battery according to claim 17, wherein the electrolyte layer comprises an electrolyte selected from a gel polymer electrolyte using PEO, PVdF, PVdF-HFP, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).
 19. The cable-type secondary battery according to claim 17, wherein the electrolyte layer further comprises a lithium salt.
 20. The cable-type secondary battery according to claim 19, wherein the lithium salt is selected from the group consisting of LiCl, LiBr, LiI, LiClO₄, LiBF₄, LiB₁₀Cl₁₀, LiPF₆, LiCF₃SO₃, LiCF₃CO₂, LiAsF₆, LiSbF₆, LiAlCl₄, CH₃SO₃Li, CF₃SO₃Li, (CF₃SO₂)₂NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and mixtures thereof.
 21. The cable-type secondary battery according to claim 17, wherein the separator is a porous substrate made of a polyolefin-based polymer selected from the group consisting of ethylene homopolymers, propylene homopolymers, ethylene-butene copolymers, ethylene-hexene copolymers, and ethylene-methacrylate copolymers; a porous substrate made of a polymer selected from the group consisting of polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyether ether ketones, polyether sulfones, polyphenylene oxides, polyphenylene sulfides and polyethylene naphthalenes; or a porous substrate made of a mixture of inorganic particles and a binder polymer.
 22. A cable-type secondary battery comprising: two or more cores each including an electrolyte and for supplying lithium ions; two or more inner electrodes arranged in parallel to each other, each inner electrode comprising an inner current collector surrounding an outer surface of a core of the two or more cores for supplying lithium ions and an inner electrode active material layer formed on a surface of the inner current collector; a separation layer surrounding respective outer surfaces of the inner electrodes; and an outer electrode surrounding an outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector.
 23. A cable-type secondary battery comprising: two or more cores each including an electrolyte and for supplying lithium ions; two or more inner electrodes arranged in parallel to each other, each inner electrode comprising an inner current collector surrounding a core of the two or more cores for supplying lithium ions and an inner electrode active material layer formed on a surface of the inner current collector, two or more separation layers, each separation layer surrounding an outer surface of an inner electrode of the two or more inner electrodes; and an outer electrode surrounding respective outer surfaces of the separation layers and comprising an outer electrode active material layer and an outer current collector.
 24. A cable-type secondary battery comprising: a hollow inner electrode comprising an inner current collector and an inner electrode active material layer formed on a surface of the inner current collector, the inner electrode being continuous along a length direction of the cable-type secondary battery; a separation layer surrounding an outer surface of the inner electrode to prevent a short circuit between electrodes; and an outer electrode surrounding an outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector.
 25. The cable-type secondary battery according to claim 24, wherein the inner current collector is an open-structured inner current collector.
 26. The cable-type secondary battery according to claim 25, wherein the open-structured inner current collector is in the form of a wound wire or a mesh.
 27. The cable-type secondary battery according to claim 24, wherein in the outer electrode, the outer electrode active material layer is formed to surround the outer surface of the separation layer, and the outer current collector is formed to surround an outer surface of the outer electrode active material layer; the outer current collector is formed to surround the outer surface of the separation layer, and the outer electrode active material layer is formed to surround an outer surface of the outer current collector; the outer current collector is formed to surround the outer surface of the separation layer, and the outer electrode active material layer is formed to surround the outer surface of the outer current collector and come into contact with the separation layer; or the outer electrode active material layer is formed to surround the outer surface of the separation layer, and the outer current collector is formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom.
 28. The cable-type secondary battery according to claim 24, further comprising a core disposed within the hollow inner electrode and including an electrolyte for supplying lithium ions, wherein the electrolyte comprises an electrolyte selected from a non-aqueous electrolyte solution using ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl formate (MF), γ-butyrolactone (γ-BL), sulfolane, methyl acetate (MA) or methyl propionate (MP); a gel polymer electrolyte using PEO, PVdF, PVdF-HEP, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).
 29. The cable-type secondary battery according to claim 24, further comprising a core disposed within the hollow inner electrode and including an electrolyte for supplying lithium ions, wherein the electrolyte further comprises a lithium salt.
 30. The cable-type secondary battery according to claim 29, wherein the lithium salt is selected from the group consisting of LiCl, LiBr, LiI, LiClO₄, LiBF₄, LiB₁₀Cl₁₀, LiPF₆, LiCF₃SO₃, LiCF₃CO₂, LiAsF₆, LiSbF₆, LiAlCl₄, CH₃SO₃Li, CF₃SO₃Li, (CF₃SO₂)₂NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and mixtures thereof.
 31. A cable-type secondary battery comprising: two or more hollow inner electrodes arranged in parallel to each other, each inner electrode comprising a hollow inner current collector and an inner electrode active material layer formed on a surface of the inner current collector; a separation layer surrounding respective outer surfaces of the inner electrodes; and an outer electrode surrounding an outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector.
 32. A cable-type secondary battery comprising: two or more hollow inner electrodes arranged in parallel to each other, each inner electrode comprising a hollow inner current collector and an inner electrode active material layer formed on a surface of the inner current collector, two or more separation layers, each separation layer surrounding an outer surface of an inner electrode of the two or more inner electrodes; and an outer electrode surrounding respective outer surfaces of the separation layers and comprising an outer electrode active material layer and an outer current collector.
 33. The cable-type secondary battery according to claim 2, wherein the electrolyte is a liquid electrolyte and the core further includes a porous carrier.
 34. The cable-type secondary battery according to claim 2, wherein the electrolyte is a gel-type polymer electrolyte and the core further includes a porous support or a cross-linked polymer.
 35. The cable-type secondary battery according to claim 2, further comprising a protection coating surrounding the outer electrode.
 36. The cable-type secondary battery according to claim 35, wherein the protection coating is comprised of a polymer resin. 